expect ssh login help

[monteo7]

Hello, I'm trying to automate the login of ssh and then interact when a prompt is reached. I don't know if I'll be getting an "accept key" prompt or a password prompt, so I want to loop through these and when any unix prompt is reached, then exit the loop, execute a command and then interact with the user. This script prompts you for a username, password and host, then runs expect. I want to exit the login loop once a prompt is reached, run the "uname" command and then (hopefully) interact.
Any help would be greatly appreciated, thank you.

I didn't see any code tags, will this work?

#!/bin/ksh 
 
#get username, password and host information from user 
username= 
password= 
host= 
 
clear  #clear screen 
 
until [[ "$username"  != "" ]];do  
  print -n "Enter username: " 
  read username 
done 
 
until [[ "$password" != "" ]];do 
  print -n "Enter your password: " 
  stty -echo 
  read password 
done 
 
#return echo to terminal 
stty echo 
 
until [[ "$host" != "" ]];do 
  echo '' 
  print -n "Enter remote host: " 
  read host 
done 
 
#initiate ssh connection and loop through possible prompts (accept key or password) 
# once prompt is reached run uname command and then interact 
expect_output=$(expect -c " 
  set prompt "(%|#|\\\$) $"  ;# default prompt 
  set timeout 10 
  match_max 100000 
  spawn ssh $username@$host 
  expect { 
    stty -echo 
    "*yes/no*" { send \"yes\r\"; exp_continue } 
    "*assword:" { send \"$password\r\"; exp_continue } 
    stty echo   
    $prompt { send \"uname\r\" } 
  } 

  interact 
  exit 
} 
 
 
#display output from expect 
echo "" 
echo $expect_output 
 
#clean up 
username= 
password= 
host= 
expect_output= 
 
#exit script 
exit0

 

[monteo7]

correction, the "accept key" from above should read "key fingerprint", which is stored in known_hosts file.

 

[macd68]

I can help you with the expect portion of this but I'm not much of a ksh guy.

Have you taken a look at the comp.lang.tcl archives? There may already be an answer to your issue.

 

[monteo7]

macd68, thanks for your help and yes I have looked at comp.lang.tcl and only found things like the following, however I'm not entering my loop in that way.

for {set i 1} {i<10} {incr i} { 
         send a commanda 
         expect { 
         1 {puts 1} 
         2 {puts 2} 
         3 {........} 
         } 
         send a commandb 
}

Not a ksh guy...well me neither but I'm restricted to it. However, this isn't a ksh question, I can't exit the loop even through an expect script (#!/bin/expect):

expect { 
    stty -echo 
    "*yes/no*" { send \"yes\r\"; exp_continue } 
    "*assword:" { send \"$password\r\"; exp_continue } 
    stty echo   
    $prompt { send \"uname\r\" } 
  } 
  interact
  ...